The 1997 Denver Broncos allowed 4.7 ypr on defense, the worst ever by a Super Bowl champion. The Chiefs are currently allowing 4.9 ypr, 31st in the league.
Five worst defensive ypr by Super Bowl participants:
1997 Broncos: 4.73 ypr (Won Super Bowl)
1984 Dolphins: 4.71 ypr (Lost Super Bowl)
1987 Broncos: 4.44 ypr (Lost Super Bowl)
1973 Vikings: 4.39 ypr (Lost Super Bowl)
1982 Dolphins: 4.39 ypr (Lost Super Bowl)
So how did the Broncos overcome that defensive flaw? Easy. They had a dominant running game, led by Terrell Davis. He could not be stopped. His seven straight playoff games rushing for over 100 yards between 1997-98 is an NFL record. That's how you overcome a suspect rush defense.
So are the Chiefs a dominating rushing team? Don't think so.
Big Lou